Andy Murray

Britain's Andy Murray poses with the trophy after defeating Serbia's Novak Djokovic in the championship match at the U.S. Open tennis tournament, Monday, Sept. 10, 2012, in New York. Murray won 7-6 (10), 7-5, 2-6, 3-6, 6-2.

Andy Murray reacts after beating Novak Djokovic — AP Photo/Charles Krupa

Britain's Andy Murray reacts after beating Serbia's Novak Djokovic in the championship match at the 2012 US Open tennis tournament, Monday, Sept. 10, 2012, in New York.

Britain's Andy Murray reacts after beating Czech Republic's Tomas Berdych in a semifinal match at the 2012 US Open tennis tournament, Saturday, Sept. 8, 2012, in New York.

Andy Murray jogs off the court during a break — AP Photo/Henny Ray Abrams

Andy Murray of Great Britain jogs off the court during a break between sets while playing Marin Cilic of Croatia in the quarterfinals of the 2012 US Open tennis tournament, Wednesday, Sept. 5, 2012, in New York.

Britain's Andy Murray returns a shot to Alex Bogomolov Jr., of Russia, at the 2012 U.S. Open tennis tournament, Monday, Aug. 27, 2012, in New York. Murray won the match.

149863815.jpg_andy.jpg — Paul Gilham/ Getty

Andy Murray of Great Britain poses with his gold and silver medals holding a Union Jack after the medal ceremony for the mixed doubles tennis of the London 2012 Olympic Games on Aug. 5, 2012. Murray won gold in the men's singles, defeating Roger Federer, on Sunday morning. Later that day, he and Laura Robson took silver in the mixed doubles.

Andy Murray of Great Britain celebrates winning his Gentlemen's Singles fourth-round match against Marin Cilic of Croatia on day eight of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on July 3, 2012, in London. One of the world's top-ranked players, Murray has been runner-up in three Grand Slam finals.

Andy Murray reacts — AP Photo/Anja Niedringhaus

Andy Murray of Britain reacts during a second round men's singles match against Ivo Karlovic of Croatia at the All England Lawn Tennis Championships at Wimbledon on June 28, 2012. Born in Glasgow, Scotland, in 1987 into a family of athletes, Murray has been playing tennis since he was 5.

Andy Murray of Britain screams after missing a return in his quarter final match against David Ferrer of Spain at the French Open tennis tournament in Roland Garros stadium in Paris, June 6, 2012.

Andy Murray shouts as he plays Novak Djokovic — AP Photo/Andrew Brownbill

Andy Murray of Britain shouts as he plays Novak Djokovic of Serbia during their semifinal at the Australian Open tennis championship, in Melbourne, Australia, Jan. 27, 2012.

Britain's Andy Murray falls over during his third-round match against France's Michael Llordra at the Australian Open tennis championship, in Melbourne, Australia,Jan. 21, 2012.

Andy Murray of Great Britain bows after winning his fourth-round match against Richard Gasquet of France on Day Seven of the Wimbledon Lawn Tennis Championships at the All England Lawn Tennis and Croquet Club on June 27, 2011, in London.

Andy Murray returns the ball to defending champion Spain's Rafael Nadal — AP Photo/Michel Euler

Britain's Andy Murray returns the ball to defending champion Rafael Nadal of Spain during their semifinal match of the French Open tennis tournament, at the Roland Garros stadium in Paris, June 3, 2011.

Britain's Andy Murray celebrates his win over Spain's David Ferrer in their men's semifinal at the Australian Open tennis championships in Melbourne, Australia, Jan. 28, 2011.

Andy Murray of Britain chases down the ball to return a shot to Stanislas Wawrinka of Switzerland at the U.S. Open in New York, Sept. 5, 2010.

Britain's Andy Murray shouts after winning a point from Jo-Wilfried Tsonga of France, during their men's singles quarterfinal at the All England Lawn Tennis Championships at Wimbledon, June 30, 2010.

Andy Murray of Britain plays a return ball to Ernests Gulbis of Latvia during their second round singles match at Wimbledon, June 25, 2009.

Andy Murray, of Britain, celebrates a point against Novak Djokovic, of Serbia, during the men's singles final at the Sony Ericsson Open tennis tournament April 5, 2009, in Key Biscayne, Fla.

Britain's Andy Murray takes a tumble as he moves to return the ball to Italy's Potito Starace during their second round match at the Roland Garros stadium in Paris, May 27, 2009.

Andy Murray holds the trophy after defeating Spain's Rafael Nadal during the final match of the Capitala World Tennis Championship in Abu Dhabi, United Arab Emirates, Jan. 3, 2009.

Andy Murray of Britain serves the ball to Gael Monfils from France, during his tennis match at the Madrid Masters, in Madrid, Oct 17, 2008.

The crowd applauds Britain's Andy Murray as he wins a point from France's Richard Gasquet, during their Men's Singles, fourth round match on the Centre Court at Wimbledon, June 30, 2008.

Thirteenth-seed Andy Murray, of Great Britain, returns to opponent Wesley Moodie, of South Africa, during their match at the Pacific Life Open tennis tournament in Indian Wells, Calif., March 11, 2007.

Andy Murray of Great Britain lunges at the net in action during the third rubber doubles match against Andy Ram and Jonathan Erlich of Israel in the Euro/Africa group Davis Cup tie between Great Britain and Israel at Devonshire Park on July 22, 2006 in Eastbourne, England.